---------------------------------------------
种属 X Y Z
---------------------------------------------
SECTION: 1
A 1.848619 1.582796 1.349302
A 20.172221 20.905973 20.413518
A 300.123368 300.858961 300.062884
B 0.081323 0.962245 0.789389
B -10.080619 10.460796 10.232643
B 20.158592 20.558881 20.810072
B 30.040001 30.396778 30.440985
B -40.234084 40.841827 40.962371
B -50.083416 50.965033 50.599511
9
SECTION: 2
A 1.039361 1.083161 1.196213
A 2.062854 2.139038 2.816729
A -3.006590 3.216112 3.572373
B 0.243749 0.543359 0.182552
B 10.032008 10.739505 10.612087
B 20.447332 20.769692 20.250109
B 30.418974 30.423231 30.714857
B 40.049398 40.245436 40.436503
B 50.281022 50.285650 50.940581
9
SECTION: 3
A 1.501221 -1.178652 1.207210
A 2.591375 2.032659 2.696039
A 3.547986 -3.013103 3.335812
B 0.623798 0.667415 -0.158201
B 10.506206 10.503887 10.569942
B 20.434901 20.725068 20.040697
B 30.809398 30.813832 30.861267
B 40.631542 40.057119 40.639891
B 50.425994 50.928598 50.140000
9
SECTION: 4
.... ........ ........ ........
.... ........ ........ ........
9
SECTION: n
.... ........ ........ ........
.... ........ ........ ........
------------------------------------------
也就是说想实现对各个SECTION取平均后,得到一组下面这个形式的统计平均
-----------------------------------------------------
A A1的X_平均 A1的Y_平均 A1的Z_平均
A A2的X_平均 A2的Y_平均 A2的Z_平均
A A3的X_平均 A3的Y_平均 A3的Z_平均
B B1的X_平均 B1的Y_平均 B1的Z_平均
B B2的X_平均 B2的Y_平均 B2的Z_平均
B B3的X_平均 B3的Y_平均 B3的Z_平均
B B4的X_平均 B4的Y_平均 B4的Z_平均
B B5的X_平均 B5的Y_平均 B5的Z_平均
B B6的X_平均 B6的Y_平均 B6的Z_平均
------------------------------------------------------